Human-alien hybrids are everywhere in scifi. Whether they come from interplanetary love or mutant genes quietly sneaking into our DNA, we're all about hooking up the Human factor with anything else out there. Just ask Captain Kirk, who tried to dock with every alien woman he encountered. Check out our list below of some of the best science fiction halfsies. Hybrid vigor!

Spock: Not only could Spock serve as the poster boy for the entire half-human/half-something else universe, but they also worked his background into several episodes of the show, and the plot of a couple of the films. Plus it gave them the opportunity to write lines like "All right, you mutinous, disloyal, computerized half-breed. We'll see about you deserting my ship." Which Kirk said, and not Bones, who relished in taking digs at Spock's dual heritage. He also helped carve the way for other Stark Trek halfsies, like Deanna Troi (half Human/half Betazoid and Worf's son Alexander, who is 1/4 Human, 3/4 Klingon and 4/4 whiny.

Doctor Who: Everyone knows that Doctor Who is from Gallifrey, right? Well, not the writers of the 1996 Doctor Who television movie. They had the 8th Doctor be half-human "On my mother's side," which opened up an enormous can of worms in the continuity, amongst the fans, and pretty much throughout space-time. The 10th Doctor later revealed that Time Lords can rewrite their DNA to imitate alien species, which seems like a stopgap effort at fixing that particular problem.

Ripley: In Alien Resurrection (shudder) Ripley was brought back as a clone with half-human/half-alien DNA, with an alien queen embryo implanted inside her. The military scientists extracted the embryo, but decided to keep Half-Ripley alive. Which, of course, turned out to be a mistake because her human side is imbued with "kickass." Her resulting offspring was also a mix of Alien with Human traits. In fact, the original design for the creature featured very prominent male and female genitalia, which they finally removed in post-production. According to director Jean-Pierre Jeunet, "Even for a Frenchman, it's too much."

Elizabeth: This half Alien/half human child from V: The Final Battle was the resulting offspring from the climactic ending of episode two of that miniseries. When Robin gave birth to those two babies, one a girl with a forked tongue, and the other a boy who looked like a lizard, it was one of the most shocking moments of the show. It was probably only topped by the fact that the Visitors were reptilian aliens. Elizabeth ended up having strange magical powers that saved the day in the end, plus the bacteria that killed her brother but left her alive was developed into a weapon called "Red Dust" that the humans used against the Visitors. Looks like cross-species sex pays off after all. Just ask the Cylons, and while you're at it find out what the hell is happening with the whole Hera subplot, especially now that we have Nicky and Hera: dual Cylon offspring.

Robocop: Okay, in all fairness, he wasn't really half human, since most of his body had been replaced by robo-parts, but he still had a human brain and a human face. In fact, I'm not sure why the bad guys didn't just target his lower jaw whenever they were out fighting him in public. Looked fairly vulnerable to me. Still, he did have to power down from time to time (so he could dream and further the human plot points) and he also ate that strange sludge that tasted like baby food, so he had enough human workings going on in there. Thank you for your cooperation.

Mariner: Kevin Costner's Waterworld flick has been popping up on cable every time you blink lately, and I have to admit that this film isn't as bad as I remember. Sure there are some dorky moments, but Costner's Mariner character as a half Human/half fish combo leads an interesting life. Rather than seeing him battle Dennis Hopper and his cronies, I'd like to see a Discovery Channel-esque special that just followed him around on his trimaran and showed us what his life was like. After all, at the end of the movie he returns to the waters to do... who knows what?

King of the Land of Half: Did you know there was an entire land dedicated to Halves? Everything in the entire land was split into different halves, and was presided over by a king who wore half kingly robes, and a half suit of armor. His crown was made up of two different halves, and his breakfast bowl was made up of try different types of bowls, perfect to hold his Quaker Halfsies cereal in. This rice/corn combo cereal came and went in the early 1980s, but not before Jay Ward of Rocky and Bullwinkle fame could animate this Half King/Half King wonder. He might not be scifi, but the cereal featured Nutrasweet, which is certainly space-aged and likely to turn us all into mutants. And speaking of mutants...

Kuato: Technically he might be a mutant, but he sure looked like a half Mutant/half Human to us. After all, he couldn't get around very well without the lug whose belly he was growing out of walking around and feeding him and all that jazz. What was really special was that no matter how fucked-up you thought Kuato looked, he was the real brains of the operation. You sure hope that poor guy never got punched in the stomach, plus it probably made shopping for clothes a real interesting experience. I just want to know where Kuato "went" while he was tucked up inside the guy's guts. Was it like regressing back to the womb? Check out the clip below that shows what he might have been like at parties.